Lenovo ThinkSystem SN850 Руководство по эксплуатации - Страница 18
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Memory options
The SN850 uses Lenovo TruDDR4 memory operating at speeds up to 2666 MHz.
TruDDR4 Memory uses the highest quality components that are sourced from Tier 1 DRAM suppliers and
only memory that meets the strict requirements of Lenovo is selected. It is compatibility tested and tuned
on every ThinkSystem server to maximize performance and reliability. TruDDR4 Memory has a unique
signature that is programmed into the DIMM that enables ThinkSystem servers to verify whether the
memory that is installed is qualified and supported by Lenovo.
From a service and support standpoint, Lenovo TruDDR4 memory automatically assumes the Lenovo
system warranty and Lenovo provides service and support worldwide.
All DIMMs operate at a speed of 2666 MHz, both at 1 DIMM per channel and 2 DIMMs per channel.
However, if the processor selected has a lower memory bus speed (eg 2400 MHz), then all DIMMs will
operate at that lower speed.
The following table lists the memory options that are available for the SN850 server.
Table 14. Memory options
Part
Feature
number
code
Description
RDIMMs
7X77A01301 AUU1
ThinkSystem 8GB TruDDR4 2666 MHz (1Rx8 1.2V) RDIMM
7X77A01302 AUNB
ThinkSystem 16GB TruDDR4 2666 MHz (1Rx4 1.2V) RDIMM
7X77A01303 AUNC
ThinkSystem 16GB TruDDR4 2666 MHz (2Rx8 1.2V) RDIMM
7X77A01304 AUND
ThinkSystem 32GB TruDDR4 2666 MHz (2Rx4 1.2V) RDIMM
LRDIMMs
7X77A01305 AUNE
ThinkSystem 64GB TruDDR4 2666 MHz (4Rx4 1.2V) LRDIMM
3DS RDIMMs
7X77A01307 AUNF
ThinkSystem 128GB TruDDR4 2666 MHz (8Rx4 1.2V) 3DS RDIMM 48 (12 per processor)
The following rules apply when selecting the memory configuration:
The server supports RDIMMs, LRDIMMs and 3DS RDIMMs. UDIMMs are not supported.
Mixing RDIMMs and LRDIMMs is not supported.
Mixing 3DS RDIMMs with either RDIMMs or LRDIMMs is not supported.
Mixing x4 and x8 DIMMs is supported.
For best performance, populate memory DIMMs in quantities of 6 or 12 per processor, so that all
memory channels are used.
The following memory protection technologies are supported:
ECC
SDDC (for x4-based memory DIMMs; look for "x4" in the DIMM description)
ADDDC (for x4-based memory DIMMs; Gold and Platinum processors only)
Memory channel mirroring
Memory rank sparing
If memory channel mirroring is used, then DIMMs must be installed in pairs or sets of three (minimum of
one pair or set of three per processor), and all DIMMs in the pair or set of three must be identical in type
and size. 50% of the installed capacity is available to the operating system
Lenovo ThinkSystem SN850 Server
Maximum
supported
48 (12 per processor)
48 (12 per processor)
48 (12 per processor)
48 (12 per processor)
48 (12 per processor)
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